package main
import (
	"fmt"
	"bytes"
	"strings"
)

func main() {
	buf:=bytes.NewBuffer(nil)
	buf.WriteString("hello,")
	buf.WriteString("world!")
	buf.Write([]byte{65,66})
	buf.Write([]byte{67,68})

	fmt.Println(strings.Trim(buf.String()," \t"))
}
